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2.5 Terminal Functions

TMS320C6421

Fixed-Point Digital Signal Processor

SPRS346A – JANUARY 2007 – REVISED MARCH 2007

The terminal functions tables (Table 2-7 through Table 2-28) identify the external signal names, the

associated pin (ball) numbers along with the mechanical package designator, the pin type, whether the pin

has any internal pullup or pulldown resistors, and a functional pin description. For more detailed

information on device configuration, peripheral selection, multiplexed/shared pin, and debugging

considerations, see the Device Configurations section of this data manual.

All device boot and configuration pins are multiplexed configuration pins— meaning they are multiplexed

with functional pins. These pins function as device boot and configuration pins only during device reset.

The input states of these pins are sampled and latched into the BOOTCFG register when device reset is

deasserted (see Note below). After device reset is deasserted, the values on these multiplexed pins no

longer have to hold the configuration.

For proper device operation, external pullup/pulldown resistors may be required on these device boot and

configuration pins. Section 3.2.1, Pullup/Pulldown Resistors discusses situations where external

pullup/pulldown resistors are required.

Note: Internal to the chip, the two device reset pins RESET and POR are logically AND’d together for the

purpose of latching device boot and configuration pins. The values on all device boot and configuration

pins are latched into the BOOTCFG register when the logical AND of RESET and POR transitions from

low-to-high.

Table 2-7. BOOT Terminal Functions

SIGNAL

TYPE(1)

OTHER(2)(3)

DESCRIPTION

ZWT

ZDU

NAME

NO.

BOOT

GP[25]/

(BOOTMODE3)

G16

H21

Bootmode configuration bits. These bootmode functions along with

GP[24]/

the FASTBOOT function determine what device bootmode

(BOOTMODE2)

G15

L20

IPD

configuration is selected.

I/O/Z

DVDD33

The C6421 device supports several types of bootmodes along with a

GP[23]/

F15

K20

FASTBOOT option; for more details on the types/options, see , Boot

(BOOTMODE1)

F18

J20

Modes.

GP[22]/

(BOOTMODE0)

Fast Boot

GP[26]/

IPD

G17

K19

I/O/Z

0 = Not Fast Boot

(FASTBOOT)

DVDD33

1 = Fast Boot

EM_A[4]/

IPD

GP[10]/

A17

B21

I/O/Z

DVDD33

(PLLMS2)

Fast Boot PLL Multiplier Select (PLLMS)

EM_A[1]/(ALE)/

IPD

GP[9]/

A16

B20

I/O/Z

These pins select the PLL multiplier for Fast Boot.

DVDD33

(PLLMS1)

For more details, see , Fast Boot PLL Multiplier Select (PLLMS).

EM_A[2]/(CLE)/

IPD

GP[8]/

B16

A20

I/O/Z

DVDD33

(PLLMS0)

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal

(2)

IPD = Internal pulldown, IPU = Internal pullup. For more detailed information on pullup/pulldown resistors and situations where external

pullup/pulldown resistors are required, see Section 3.2.1, Pullup/Pulldown Resistors.

(3)

Specifies the operating I/O supply voltage for each signal

Device Overview

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